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In electro-mechanical conversion devices like generators and motors the reason why a small air gap is left between the rotor and stator is to

A. permit mechanical clearance

B. increase flux density in air gap

C. decrease the reluctance of magnetic path

D. complete the magnetic path

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  1. The mass of proton is __________ the mass of an electron.
  2. Which of the following statements is TRUE?
  3. Whenever a flux inking a coil or current changesa an emf is induced in it. This is known as
  4. The temperature coefficient of resistance of eureka is
  5. What is the SI unit of specific resistance or resistivity?
  6. It is the reciprocal of reluctance and implies the case of readiness with which magnetic flux is developed.
  7. The magnetic field inside a solenoid
  8. Residual magnetism refers to the flux densitya which exists in the iron core when the magnetic field…
  9. Mmf in a magnetic circuit corresponds to _____ in an electric circuit
  10. What is the cgs unit of magnetomotive force?
  11. States that the ratio of the thermal conductivity is proportional to the absolute temperature for all…
  12. When a conductor is stationary and the magnetic field is moving or changing the emf induced is called
  13. Refers to the magnetic lines
  14. A magnetic flux of 2.5 x10^4 Wb through an area of 5 x10^4 square meters results in
  15. If a magnetic flux cuts across 200 turns at a rate of 2Wb/sa the induced voltage according to Faraday's…
  16. How many turns are needed to produce a magnetomotive force of 1000 A.t for a coil with 6 amperes?
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    A magnetic pole produces 5000 field lines. How much is the flux in webers? A. 50 10^-6
  18. Permeance of a magnetic circuit is _________ the cross-sectional area of the circuit.
  19. Defined as the ratio of the volume occupied by the atoms or ions in a unit cell divided by the volume…
  20. Which of the following electric quantities is vector in character?
  21. The idea of preventing one component from affecting another through their common electric and magnetic…
  22. The air space between poles of magnets
  23. If the magnetic material is located within a coil through which alternating current (60 Hz frequency)…
  24. All magnetic field originates from
  25. The magnetic field of a magnetized iron bar when strongly heated
  26. What is the other name for dielectric strength?
  27. The unit of flux is _____ in cgs system.
  28. A t/m is a unit of
  29. One oersted (Oe) is equivalent to _____ Gb/cm.
  30. Who developed the electromagnetic theory of light in 1862?